Click on the "Help" option, and select "About...". Then when Wizbang (the company that developed the game) first appears, right click twice on the second line of the copyright statement. The special teams that are unlocked include Robots, Microsoft, and Wizbang. Alternatively, enter "ROBOTS", "MICROSOFT", or "WHIZBANG" as a user name.
While in the batter's box, hold [Ctrl] + R. If you entered the code correctly, you will hear the sound of a gun. Repeat this code to return to normal.
Press [Ctrl] + T to practice pitching and fielding.
Press S to have the batter spit. Keep pressing that key until the programmer baseball cards appear.